Integrated forecasting can provide higher accuracy than a single forecasting.Based on this,an integrated concrete strength curve was obtained for the ultrasonic-rebound combined method.This curve is the linear weighted aggregation of three curves provided by three models: three-parameter regression,five-parameter regression and Shepard interpolation model.The corresponding weight vector was obtained by the genetic algorithms(GA) to minimize the Theil coefficient.An example demonstrates that the fitting accu...